Function relativize_glob 

pub fn relativize_glob<'a>(
    glob: &'a str,
    relative_to: &FileSystemPath,
) -> Result<(&'a str, FileSystemPath)>

The globs defined in the next.config.mjs are relative to the project root. The glob walker in turbopack is somewhat naive so we handle relative path directives first so traversal doesn’t need to consider them and can just traverse ‘down’ the tree. The main alternative is to merge glob evaluation with directory traversal which is what the npm glob package does, but this would be a substantial rewrite.